(1. Key Laboratory of Institute Shale Gas and Geoengineering，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Key Laboratory for Mechanics in Fluid Solid Coupling Systems，Institute of Mechanics，Chinese Academy of Sciences，Beijing 100190，China；4. ANSTEEL Blasting Co.，Ltd.，Anshan，Liaoning 114046，China)
Abstract：A one dimensional model for jointed rock is established and dimension analysis is carried out to investigate the effect of joints on stress wave propagation. For a single joint，the stress wave exhibited obvious time delay and amplitude attenuation，but there was no significant change in the main frequency. For multiple joints，the amplitudes of transmitted stress waves were reduced as the spacing and number of joints increased. The equivalent wave velocity in the jointed rock masses was reduced linearly as the number of joints increased. The influence of several joint parameters，such as the strength，stiffness，spacing and dip angle，on the blasting effect was discussed by using the Continuous-Discontinuous Element Method，which was then comprehensively evaluated in terms of several indexes such as the average fragmentation sizes，limit fragmentation sizes，percentage of massive blocks，system fragmentation degree and equivalent damage factor. The calculated results show that the blasting effect become worse gradually as the decreasing of strength(stiffness) of joint. When the strength(stiffness) of the joint is smaller than one thousandth of that of rock, the strength(stiffness) of joint has little influence on the blasting effect. When the strength(stiffness) of the joint is one thousandth of that of rock，the blasting effect is worse as the joints come closer，however，the dip angle of the joints has little influence on the blasting effect. Due to the fact that the blasting energy is trapped between the blast hole and adjacent joints during blasting in the jointed rock mass，the area near the blast hole is always over fragmented，whereas the area far away from the blast hole is under fragmented. A negative correlation is thus found between the development degree of the joints within the blasting area and the blasting effect.
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2018, Vol. 37 
